Quote:
Originally Posted by DirtyCoconuts
They are random and the farther apart the holes are the less likely that two hidden stress fractures will intersect and cause a structural failure.
Same in glass, the closer the holes the more likely the vibrations will break the work
---------- Post added at 01:52 PM ---------- Previous post was at 01:50 PM ----------
And sorry, I misspoke. I mean 45*
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Such pots are slip-cast and sintered. Unless they are not cooled properly after firing, the likelihood of there being restrained stresses is minimal. Beside, the extreme porosity of such a body means that a stress crack with be relieved over a very short distance and won’t propagate.
Unless you’re dealing with tempered glass or a vase that wasn’t annealed properly, the breakage between two closely-spaced holes is due to vibrations and the brittleness of the material, not stored stress.